Punch-centering device



n. e. H'ALLOCK. :iPUNCHCENTERING DEVICE. APPLICATION FILED noy. 25, 1919.

' Patented Aug. '16, 1921.

2 SHEETS-SHEET l- Jive/afar- IP. G.//aZZ0e/3- R. G. HALLOCK.

PUNCH CENTERING DEVYICE. APPLICATION FILED NOV. 25, 1919.

Patented Aug. 16,1921.

2 SHEETS-SHEET 2- UNITED STATES RAYMOND G. HALLOCK, OE SEATTLE, WASHINGTON.

PATENT crates,

PUNGH-CENTERING DEVICE.

"Specification of Letters'Patent. Patented Aug. 15', 1921- Application filed November 25, 1919. Serial No. 340,671. r

"T 0 all whom it may concern siding at 9101 36th St. S. W., Seattle, in the county of King and State of Washington, have invented certain new and useful Improvements in Punch-Centering Devices, of which the following is a specification,

This invention relatesto a punch-center locating means, whereby the operator may accurately determine the exact point in the work piece with which the punch will engage in operation.

The invention provides: a means whereby todirect anarrow beam of light fro-m each of two independent sources upon the work piece, so that such light beams will intersect in the exact center of the punch area, to thereby enable the operator to determine, and maintain the accuracy of'suc-h punching-goperations. r

Through the use of light beams as the 10- cating factors, the. work will be illuminated at the punch point, thus enabling the work to be accurately carried out under otherwise impossible general light conditions, as on dark days or in shaded or darkened press or work conditions.

In the drawings:

Figure 1 is a view in elevation of the improved device.

Fig. 2 is a plan view of the same.

Fig. 3 is a perspective of one of the light beam directing arms.

Fig. 1 is a sectional view through one of said arms and its support.

The improved punch-center locating means, comprises a bar 1, adapted to be removably secured to a punch press in proper relation to the punch 2 thereof. A frame-plate 3 is secured centrally to such bar, and projects forwardly therefrom, being terminally formed with a bearing end 4 to receive a rod 5. i

The rod 5 has a central portion 6, to be secured in the bearing end 4 of the frame bar, and equal supporting portions 7 inclining forwardly on divergent lines as shown.

Rotatably supported on the free end of each supporting portion 7 of the rod 5 is a light-beam directing arm 8, comprising a narrow metallic strip having a sleeve portion 9 to engage the rod end and a flat straight section 10 of appropriate length, with the end thereof turned upwardly to form a light screen 11. The light screen is formed with a narrow vertically extending slot 12 arranged centrally and longitudifnally of such screen. The light screens 11 are at right angles to the sections 10 of the arms and hence in angularly related planes, extending vertically, however, in parallelism as to similar vertical planes-therethrough.

The ends of the bar 1, are formed with the usual sockets 13 to receive lamps 14:, to

be energized from any suitable source. The relative positions of the rod 5, arms '8, and llght screens 11, are such that the single light beam from each lamp, permitted to pass through theslot 12 in the particular screen will be directed on to the work-piece 15, as a narrow beam of light indicated at 16. The beams, owing to the relatively angular disposition of thescreensll, will be caused to intersect, and this point of intersection, is by obv1ousinitial position of the device'on the press, ztheexact ,centerof the punch hole to be formed in the operation of the punch.

.The mounting of, the beam directing arms on the rods 5 permits adjustment of such arms to accommodate work of different thicknesses, and also the free movement of either arm in positioning work of irregular surface. To hold the arms in proper set position in the rod 5, it is preferred that springs 17 coiled about the portions 7 of the rod, bear between the end 4 of the plate 3 and washers 18 engaging the sleeve ends of the arms. A thumb screw 19 is threaded upon the rod ends to prevent displacement of the arms. 1

The device when applied enables the operator to accurately determine the punch positions on the work-piece, and this without regard to the presence or absence of additional light. Under strong additional light, the intersecting beams of the device will still be clearly defined, as the screens cut off such additionallight from the particular part of the work-piece on which the beams intersect, while in the absence of ad ditional light, the intersecting beams furnish all necessary illumination.

It is obvious that intersecting planes of shadows would accomplish my result as well as planes of ligh Claims:

1. A punch-center locating means, including independent light supports, lights there- 2. A punch center locating means including independent sources of light, and independent means for excluding from a definite area all of the light from saidsources except a single beam from each, the said means being arranged to cause said passing light beams to intersect. I

3. A punch-center locating means, comprising a rod, arms supported thereon extending toward each other, light screens carried by the arms and formed into slots, and light producing means arranged in such relation to the light screens as to cause a beam of light to pass through each of said slots, the relativedisposition of the light screens causing said passing beams to intersect. I

4. A punch-center locating means, comprising a rod, arms supported thereon extending toward each other, light screens carried by the arms and formed into slots, said screens being arrangedv at an angle to each other,'and light producing means arranged in such relation to the light screens as to cause a beam of light to pass through each of said slots, the relative disposition of the light screens causing said passing beams to intersect. 1

5. A punch-center locating means, a bar adapted to be supported on the punch pressi a frame bar carried by the first'mentlone bar, a rod secured to the frame-bar and having portions diverging therefrom, lamps carried by the bar, arms supported on the divergent portions of the rod and extending toward each other, light screens carried by the arms and formed into slots and means for directing a beam of light from said lamps through the respective slots so that said beams intersect. p

6. In a device ofthe class described, the combination of a pair of flat strips, a rod adapted to be connected to a punch press and on which said strips are pivotally supported, and the free end of each strip being upturned and slotted, a lamp behind each upturned portion whereby rays of light are caused to pass through said slots and intersect, each other.

7. In acentering device for punch press and the like the combination of a cross rod adapted to be rigidly fixed upon the press, a flat member pivoted upon each of the outer ends of the rod and having their free ends upturned and slotted, whereby either or both of the flat members may be raised to admit work of varying thicknesses and intersecting rays of light caused to be thrown upon the work regardless of the thickness of thejwork.

In testimony whereof I aflix my signature.

RAYMOND GfI-IALLOCK. 

